package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishItemVO;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    //1:新增菜品和对应的口味
    @Override
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();
        //属性拷贝
        BeanUtils.copyProperties(dishDTO,dish);
        //1:向菜品表插入1条数据
        dishMapper.insert(dish);

        //获取insert生成的主键值
        Long dishId = dish.getId();
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0){
            //2：向口味表插入n条数据
            flavors.forEach(e->e.setDishId(dishId));
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    //2：菜品-分页查询
    @Override
    public PageResult selectPage(DishPageQueryDTO pageQueryDTO) {
        PageHelper.startPage(pageQueryDTO.getPage(),pageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.selectPage(pageQueryDTO);
        long total = page.getTotal();
        List<DishVO> result = page.getResult();
        return new PageResult(total,result);
    }

    //3:删除菜品
    @Transactional
    @Override
    public void deleteVegetable(List<Long> ids) {
        //1：判断是否能删除这个菜品 --- 是否存在起售中
            //通过for循环，SQL获取每个菜品的stature
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus().equals(StatusConstant.ENABLE)){
                //当前菜品处于起售中
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        //2：判断是否能删除这个菜品 --- 是否有关联的菜品
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds != null && setmealIds.size() >0){
            //查到菜品被套餐关联 --- 不能被删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        //3：删除菜品
//        for (Long id : ids) {
//            dishMapper.deleteById(id);
//            //4：删除该菜品对应的口味数据
//            dishFlavorMapper.deleteByDishId(id);
//        }

        //批量删除菜品
        dishMapper.deleteByIds(ids);
        dishFlavorMapper.deleteByDishIds(ids);

    }

    //4：根据id查询菜品
    @Override
    public DishVO selectIdDish(Long id) {
        //查询返回菜品数据
        Dish dish = dishMapper.getById(id);

        //查询返回菜品的口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByIdFlavor(id);

        //把查询到的数据封装到dishVo里面
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    //5：修改菜品
    @Transactional
    @Override
    public void updateCai(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //修改菜品信息
        dishMapper.updateCai(dish);
        //因为口味表和菜品表是1对多关系，所以要删除再插入
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0){
            //2：向口味表插入n条数据
            flavors.forEach(e->e.setDishId(dish.getId()));
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    //6：菜品的起售与停售
    @Override
    public void StartOrStop(Integer status, Long id) {
        Dish dish = new Dish();
        dish.setId(id);
        dish.setStatus(status);
        dishMapper.updateCai(dish);
    }

    //7:根据分类id查询菜品
    @Override
    public List<Dish> getByFenId(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);
        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            if (d.getStatus() == StatusConstant.DISABLE){
                continue;
            }
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByIdFlavor(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }


}
